How much boost can a stock 5.3 take. What kind of rpms do you spin and what kind of timing are you running under boost. Im running 8 pounds and 16 degrees and shifting at 5200
How much boost can a stock 5.3 take. What kind of rpms do you spin and what kind of timing are you running under boost. Im running 8 pounds and 16 degrees and shifting at 5200
It can take all of the boost...j/k. They can take quite a lot, but I personally wouldn't run any higher than what your map sensor can read. The amount of timing is going to vary greatly depending on fuel, plugs, intercooler setup, type of boost, level of boost, etc. Shift rpm is also going to vary depending on cam/valve train, application and power curve. That being said why are you shifting so early? You should be able to push that back about 1k rpm.Originally Posted by WACHS1981
I've seen 18-20 psi on the internet, somewhere around 700-800whp. At that point you are just waiting for the rods to bend lol.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
The fastest stock bottom end 5.3 is running 4s in the 1/8th at 40 psi on methanol haha
https://sites.google.com/site/sloppywiki/
he even has the tunes on there for ya to look at
67 camaro 6.0lq4 turbo build in process
89 mustang coupe ls1 80mmturbo, holley dominator efi on e85
02 lexus is300 lq4, cam,headers,fast 92 intake
and no there isnt anything in my yard unmodified
http://www.hotrod.com/how-to/engine/...g-bang-theory/
Read the whole thing... end is great.
1994 Trans Am: LS3 Crate Swap - Cam Motion 216/226-116+3 - 0411 PCM with Lingenfelter 58x > 24x Converter - 4L60E to RPM T56 - Strange 12 Bolt - UMI Suspension - TSP 1 7/8" Headers - GMMG Exhaust
Gen3 LM7 very happy at 12PSI.
90 Octane Unleaded limits my spark : 11 degrees up high, dipping to 8 degrees between 4000-4400 rpm.
I have Just started spraying 6 gph 70% methanol a couple days ago, might be able to get more spark advance.
good job replying to a 10 year old thread...
Damn your Alaska smoke signal internet, lol. You just resurrected a thread from 10 years ago.
10 years? Feels like just yesterday lol
"It'd be a lot cooler if you did."
Kind of makes me feel old as dirt when I realize this forum has members who were not yet born when I joined.
Since we are on this. 250K mile stock LM7 in a 2003 Avalanche. 12 psi from an intercooled Torque Storm at 5,800 rpm. 16 total timing until the IATs heat up over 110F and AFR is high 10s/low 11s until it gets over 8 psi at which point I richen it up into the low-mid 10s. Remember it has no added ring gap and added fueling helps reduce the heat. 2nd gear WOT in 100F ambients, IATs reach 140F and timing is down to 13.5. Oh yea it has a stock rebuild of the 4L60E a few years ago too. What can go wrong with this one, lol. My buddy is FULL SEND with stuff too. He full sent it with a nearly empty tank of fuel, starved the fuel rail and had it misfire heavily under boost. It survived.
Last edited by Fast4.7; 1 Week Ago at 11:39 AM.
Agreed! I graduated high school in the same year you joined. Been doing this stuff longer than some of my customers now have been alive. My vehicle in high school had a SBC with a Q-Jet/HEI on it.
Last edited by Fast4.7; 1 Week Ago at 11:43 AM.
Is it turbocharged, centrifigual, or turbo? Do you have 12 psi at 4,000-4,400? The one I tuned is like 6-7 psi in that RPM range with the intercooled Torque Storm on it and wants more like 18-19* there.
I've ran as much as 18 PSI through numerous stock bottom end and 100% stock internal engines. I've had many last years at 15 PSI on pump gas, 93-94 around here.
Just gotta run em fat and keep the timing low enough and hope for the best LOL.
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Class of 06...I feel you, man. quadrajet was the first carb i ever rebuilt. They run good, whenever they run good...
Last edited by horsepowerguru427; 1 Week Ago at 12:58 PM.
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